WO2014109504A1 - Dispositif de télémétrie, et appareil de traitement d'images comprenant un tel dispositif - Google Patents

Dispositif de télémétrie, et appareil de traitement d'images comprenant un tel dispositif Download PDF

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Publication number
WO2014109504A1
WO2014109504A1 PCT/KR2013/012435 KR2013012435W WO2014109504A1 WO 2014109504 A1 WO2014109504 A1 WO 2014109504A1 KR 2013012435 W KR2013012435 W KR 2013012435W WO 2014109504 A1 WO2014109504 A1 WO 2014109504A1
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WO
WIPO (PCT)
Prior art keywords
light
distance
signal
output
output light
Prior art date
Application number
PCT/KR2013/012435
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English (en)
Korean (ko)
Inventor
정필원
이정수
조용호
이상근
고낙훈
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020130002563A external-priority patent/KR102003817B1/ko
Priority claimed from KR1020130004026A external-priority patent/KR102017147B1/ko
Priority claimed from KR1020130016146A external-priority patent/KR102014146B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US14/759,877 priority Critical patent/US9869768B2/en
Publication of WO2014109504A1 publication Critical patent/WO2014109504A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S17/36—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/42—Simultaneous measurement of distance and other co-ordinates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/002—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT

Definitions

  • the present invention relates to a distance detecting apparatus, and an image processing apparatus having the same, and more particularly, to a distance detecting apparatus capable of accurately detecting a distance to an external object, and an image processing apparatus having the same.
  • An object of the present invention is to provide a distance detecting apparatus capable of accurately detecting a distance to an external object, and an image processing apparatus having the same.
  • the light source unit for outputting the output light based on the transmission signal having a plurality of different frequencies
  • the first direction scanning and the second direction scanning sequentially
  • a scanner for outputting the output light to an external region
  • a detector for converting the received light from the outside in response to the output light into a received signal, and based on the plurality of transmitted signals and the plurality of received signals
  • a processor configured to calculate a distance to the object and vary the frequency of the transmission signal, wherein the processor is based on a first transmission signal among the plurality of transmission signals and a first reception signal corresponding to the first transmission signal.
  • a distance detecting apparatus for achieving the above object, the light source unit for outputting the output light, the modulator for driving the output light based on at least one code signal from the light source unit, and the output light
  • a demodulation section for separating code signals on the basis of an output section for outputting the signal to the outside, received light received from the outside corresponding to the output light, a code signal at the modulation section, and a code signal at the demodulation section.
  • a processor for detecting a distance to an external object.
  • an image processing apparatus for achieving the above object, a display, a light source unit for outputting the output light based on a transmission signal having a plurality of different frequencies, a first direction scanning and a second
  • the scanner sequentially outputs the output light to an external region by performing the directional scanning, a detector for converting the received light from the outside into a received signal in response to the output light, and a plurality of transmitted signals and a plurality of received signals.
  • a distance detector including a processor for calculating a distance to an external object and varying a frequency of a transmission signal, and a controller for controlling to display a 3D image on a display by using the distance information detected by the distance detector.
  • the processor is further configured to determine an external bandwidth based on the first transmission signal and the first reception signal corresponding to the first transmission signal among the plurality of transmission signals. Calculate a first distance with respect to water, and calculate a second distance with respect to the external object based on the second transmission signal corresponding to the second transmission signal and the second transmission signal among the plurality of transmission signals, and the calculated first And calculate a final distance to the external object based on the second distance.
  • an image processing apparatus including a distance detecting apparatus or a distance detecting apparatus outputs an output light based on a transmission signal having a plurality of different frequencies, and outputs the light from the outside in response to the output light.
  • the received light is converted into a received signal to calculate a distance to an external object.
  • the first distance to the external object is calculated based on the first transmission signal among the plurality of transmission signals and the first reception signal corresponding to the first transmission signal, and the second transmission signal and the second transmission signal among the plurality of transmission signals are calculated.
  • Based on the second received signal corresponding to the transmission signal a second distance to the external object is calculated, and a final distance to the external object is calculated based on the calculated first and second distances.
  • the distance to the external object can be accurately measured.
  • the distance resolution can be maintained while improving the measurable distance of the external object. . Accordingly, the performance of the distance detection device can be improved.
  • the wavelength of the first output light based on the first transmission signal and the wavelength of the second output light based on the second transmission signal may be different from each other, and the first output light and the second output light may be different from each other.
  • the output may be performed alternately for different lines or for different frames. As a result, the distance to the external object can be accurately measured.
  • the light source unit may output first output light based on the first and second transmission signals during the first time period, and output second output light based on the third and fourth transmission signals during the second time period. . In this way, by using transmission signals of different frequencies at different times, the measurable distance can be improved.
  • the 2D scanner capable of sequentially performing the first direction scanning and the second direction scanning
  • a plurality of scanners are not necessary, and the distance detection apparatus can be miniaturized.
  • the manufacturing cost can be reduced.
  • an image processing apparatus having a distance detecting apparatus or a distance detecting apparatus outputs output light based on at least one code signal to the outside, and based on the received light received from the outside, By separating the code signal and detecting the distance to the external object based on the code signal at the modulator and the code signal at the demodulator, the distance to the external object can be determined by using a code signal that is robust to external noise. It can be detected accurately.
  • the modulation technique of the code signal has an advantage of obtaining distance information from received light which is weak compared to surrounding noise.
  • the modulation technique of the code signal has an advantage of obtaining distance information from received light which is weak compared to surrounding noise.
  • different types of code signals for each distance detection device interference between devices can be prevented.
  • the light source unit uses a plurality of output lights, and accordingly adds a corresponding code signal, by using output light having a plurality of wavelengths having different absorption rates, the accuracy of received light received from an external object can be improved. In addition, it is possible to accurately detect the distance to the external object.
  • the final distance information can be calculated based on the detected distance information to accurately detect the distance to the external object. It becomes possible.
  • the spatial resolution for distance detection can be improved.
  • the spatial resolution can be improved by horizontally scanning the first output light and the second output light from the light source unit with respect to different horizontal lines.
  • the measurable distance can be extended, and the distance resolution can be improved.
  • the output light from the light source unit is sequentially scanned through a scanner and output to the external region, and detects the received light corresponding to the output light through the detection unit, the output light and Of the received light, an absorbing member that absorbs the internal scattered light generated by the polarized light separating portion that transmits a part and reflects the other part is used. Accordingly, the distance to the external object can be detected easily while removing the internal scattered light.
  • the noise by the internal scattered light is considerably smaller than the received light scattered from the external object, the measurable distance can be extended and the distance resolution can be improved.
  • FIG. 1 illustrates projecting light for distance detection in an image processing apparatus including a distance detection apparatus according to an embodiment of the present invention.
  • FIG. 2A is a diagram illustrating a scanning method during light projection of the distance detection device of FIG. 1.
  • FIG. 2B is a diagram illustrating distance information obtainable by the distance detecting apparatus of FIG. 1.
  • FIG. 3 is a view referred to for describing a distance detection method of the distance detection apparatus of FIG. 1.
  • FIG. 4 is an example of an internal structure diagram of the distance detection device of FIG. 1.
  • 5 is a diagram illustrating a distance between a distance detection device and an external object.
  • FIG. 6 is an example of an internal block diagram of the distance detecting apparatus of FIG. 1.
  • 7A to 7F are diagrams for describing an example of a distance detection method through the distance detection device of FIG. 6.
  • 8A to 8B illustrate various examples of a scanning method through the distance detection apparatus of FIG. 6.
  • FIG. 9 is another example of an internal block diagram of the distance detecting apparatus of FIG. 1.
  • 10A to 10B illustrate various examples of a scanning method through the distance detection apparatus of FIG. 9.
  • 11A to 11F are views for explaining another example of the distance detection method through the distance detection device of FIG. 6 or 9.
  • FIG. 13 illustrates projecting light for distance detection in an image processing apparatus including a distance detection device according to another embodiment of the present invention.
  • FIG. 14 is an example of an internal block diagram of the distance detection device of FIG.
  • FIG. 15 is an example of an internal structure diagram of the distance detection device of FIG. 14.
  • FIG. 16 is a diagram referred to describe a distance detection method of the distance detection apparatus of FIG. 14.
  • 17 to 19 are views referred to for describing the operation of the distance detecting apparatus of FIG. 14.
  • 20 is an example of an internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • 21A to 21C are views referred to for explaining the internal scattered light in the distance detection device.
  • 22A to 22C are various examples of the absorbing member in the distance detecting device according to the embodiment of the present invention.
  • FIG. 23 is another example of the internal structural diagram of a distance detecting apparatus according to another embodiment of the present invention.
  • 24 is another example of an internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • 25 is still another example of the internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • FIG. 26 is an internal block diagram of the mobile terminal of FIG. 1.
  • FIG. 27 is an internal block diagram of the controller of FIG. 26.
  • the image processing apparatus described in the present specification is a device to which the distance detection apparatus is mounted, and includes a mobile terminal, a TV, a set-top box, a media player, a game device, a surveillance camera, and the like, and an air conditioner, a refrigerator, a washing machine, a cooking appliance, It is also possible to include home appliances such as a robot cleaner, and may include a vehicle such as a bicycle or a car.
  • the mobile terminal includes a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a digital camera, navigation, and a tablet computer. ), E-book terminals and the like.
  • module and “unit” for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the “module” and “unit” may be used interchangeably.
  • FIG. 1 illustrates projecting light for distance detection in an image processing apparatus including a distance detection apparatus according to an embodiment of the present invention.
  • the image processing apparatus of FIG. 1 illustrates the mobile terminal 100.
  • the distance detecting apparatus 200 may be provided in an image processing apparatus such as a mobile terminal, a TV, a set-top box, a media player, a game device, a home appliance, a vehicle, and the like, and the center of the mobile terminal 100 will be described below. Describe it.
  • the mobile terminal 100 may include a camera 122 for capturing an image. Meanwhile, the mobile terminal 100 may include a distance detection device 200 for capturing 3D images.
  • the 3D camera 121 may include a camera 122 for acquiring an image of the external region 40 and a distance detection apparatus 200 for acquiring distance information of the external region 40.
  • the 3D camera 121 is a module, and may include a camera 122 and a distance detecting device 200 therein.
  • the camera 122 and the distance detecting device 200 may be provided as a separate module in the mobile terminal 100.
  • the distance detection apparatus 200 using the at least one light source, outputs the output light to the outer region 40, a plurality of scattered or reflected in the outer region 40 It is assumed that the reception light is received and the distance is detected using the difference between the output light and the reception light.
  • the distance detecting apparatus 200 outputs the output light based on a transmission signal having a plurality of different frequencies, and receives the received light received from the outside in response to the output light. Convert to a received signal to calculate the distance to the external object. As a result, the distance to the external object can be accurately measured.
  • the distance resolution can be maintained while improving the measurable distance of the external object. . Accordingly, the performance of the distance detection device can be improved. This will be described later in detail.
  • FIG. 2A is a diagram illustrating a scanning method during light projection of the distance detection device of FIG. 1.
  • the distance detecting apparatus 200 may include a light source unit 210, a light reflecting unit 214, and a scanner 240.
  • the wavelength of the light output from the distance detecting apparatus 200 may be one wavelength as a single light source. Alternatively, light of various wavelengths may be used. Hereinafter, the description will be based on the use of a single light source.
  • the light source unit 210 can output light having a predetermined wavelength as output light.
  • the output light may be light of an infrared wavelength, but is not limited thereto, and various examples such as light of a visible light wavelength may be possible.
  • the description will be based on the light of the infrared wavelength.
  • the light source unit 210 may output output light of a plurality of wavelengths.
  • the light source unit 210 for light projection to the external object, the collimability of light is important, for this purpose, a laser diode may be used, but is not limited to this, various examples are possible.
  • the output light output from the light source unit 210 may be reflected by the light reflecting unit 214 and incident on the scanner 240.
  • the scanner 240 may receive output light from the light source unit 210 and sequentially and repeatedly perform the first direction scanning and the second direction scanning to the outside.
  • the scanner 240 performs horizontal scanning from the left to the right, performs vertical scanning from the top to the bottom, and performs horizontal scanning from the right to the left, with respect to the scannable area, centering on the scanable area. And vertical scanning from top to bottom again. Such a scanning operation may be repeatedly performed on the entire external area 40.
  • the output light output to the external area 40 is scattered or reflected in the external area 40 may be incident to the distance detection device 200 again.
  • the scanner 240 may receive a reception light corresponding to the output light output to the outside.
  • the distance detecting apparatus 200 may compare the output light with the received light, and detect the distance using the difference.
  • the distance detection technique there are various methods, but in the embodiment of the present invention, a method using a phase difference is illustrated. This will be described later with reference to FIG. 3.
  • the calculated distance information may be represented as the luminance image 65 as illustrated in FIG. 2B.
  • Various distance values of the external object can be displayed as corresponding luminance levels. If the distance is close, the luminance level may be large (brightness may be bright), and if the depth is far, the luminance level may be small (brightness may be dark).
  • the distance detection apparatus 200 outputs the output light using a plurality of transmission signals having different frequencies. Then, the reception light corresponding to the output light is received, and the reception light is converted into a plurality of reception signals. Then, the distance to the external object is measured based on the plurality of transmission signals and the reception signal.
  • the outer region 40 may be divided into a first region 42 and a second region 44.
  • the first area 42 may be an area including the external object 50, that is, an active area 42, and the second area 44 does not include the external object 50.
  • the entire scanning section also includes a first scanning section corresponding to an active area 42 which is an area in which an external object exists, and a blank area 44 that is an area in which no external object exists. It may be divided into a second scanning interval corresponding to.
  • Tx denotes a phase signal of output light
  • Rx denotes a phase signal of received light
  • the processor 270 of FIG. 4 may calculate the distance information level according to the phase difference ⁇ between the phase signal of the output light and the phase signal of the received light.
  • the larger the phase difference the farther the outer region 40 is, so that the distance information level can be set larger.
  • the smaller the phase difference the closer the outer region 40 is, the smaller the distance information level is.
  • Such distance level setting is performed for each region in the outer region 40 while horizontally and vertically scanning the outer region 40 as described above.
  • the distance information level can be detected for each region of the outer region 40.
  • the processor (270 of FIG. 4) of the distance detection apparatus can calculate distance information by the phase difference of the electrical signal with respect to an output light, and the electrical signal with respect to a reception light.
  • FIG. 4 is an example of an internal structure diagram of the distance detection device of FIG. 1.
  • the distance detecting apparatus 200 includes a light source unit 210, a light collecting unit 212, a first light reflecting unit 214, a scanner 240, a second light reflecting unit 255, and a third light beam.
  • the reflection unit 256, the detector 280, and the polarization splitter 281 may include a processor 270.
  • the light collecting unit 212 collimates the output light La output from the light source unit 210.
  • the light collecting unit 212 may include a collimate lens for collimating the output light.
  • the output light may be output light to which two transmission signals La and Lb are added, that is, modulated.
  • the polarization splitter 281 transmits some polarized light of the output light La and emits some polarized light. For example, the polarization splitter 281 transmits the output light of the P polarization state in the direction of the scanner 240 by transmitting the output light of the P polarization state among the output light. On the other hand, the polarization splitter 281 reflects the received light in the S-polarized state among the reflected light, and transmits the received light in the S-polarized state to the detector 280 toward the detector 280.
  • a polarization splitter may be referred to as a polarizer beam splitter (PBS).
  • the first light reflection unit 214 reflects the output light La passing through the polarization separation unit 281 toward the scanner 240, and reflects the received light received through the scanner 240 to the polarization separation unit 281. In the direction of.
  • the first light reflecting portion 214 can reflect light of various wavelengths, instead of reflecting only the wavelength of the output light. Accordingly, the first light reflecting portion 214 may include Total Mirror TM.
  • a polarization converting part (not shown) may be provided between the first light reflection part 214 and the second light reflection part 255.
  • the polarization converting unit may convert the polarization direction of the output light and convert the polarization direction of the received light.
  • a polarization converting unit (not shown) gives a phase difference to control the polarization direction.
  • linearly polarized light can be converted into circularly polarized light, or circularly polarized light can be converted into linearly polarized light.
  • the polarization conversion unit converts the output light which is P polarized light into the output light of circular polarized light, respectively.
  • the scanner 240 can output the output light of circular polarization to the exterior, and can receive the reception light Lb of circular polarization from the exterior.
  • the polarization converting unit may convert the received light of the circularly polarized light received through the scanner 240 into the received light which is S polarized light.
  • the polarization converter (not shown) may be referred to as a quarter wave length plate (QWP).
  • the polarization conversion unit may output the output light of the P polarized light as it is without conversion, and may convert the received light of the P polarized light received from the scanner 240 into the received light of S polarized light.
  • the second light reflection unit 255 reflects the output light La from the first light reflection unit 214 toward the scanner 240 and removes the received light Lb received through the scanner 240. 1 is reflected in the direction of the light reflection portion 214.
  • the second light reflecting unit 255 can reflect light of various wavelengths instead of reflecting only the wavelength of the output light. Accordingly, the second light reflecting unit 255 may include a total mirror (TM).
  • the third light reflecting unit 256 reflects the output light passing through the second light reflecting unit 255 toward the scanner 240 and reflects the received light received through the scanner 240 to the second light reflecting unit ( 255) direction.
  • the third light reflection unit 256 can reflect light of various wavelengths instead of reflecting only the wavelength of the output light. Accordingly, the third light reflection unit 256 may include Total Mirror TM.
  • the distance detection device having a structure in which the optical output and the optical path of the optical reception are partially overlapped may be referred to as a coaxial optical system.
  • the distance detecting device having such a structure can be downsized in size, resistant to external light, and can have a high signal-to-noise ratio.
  • the distance detection apparatus having a structure in which the light output and the light path of the light reception are completely separated from each other may be referred to as a separate optical system.
  • the scanner 240 may receive output light from the light source unit 210 and sequentially and repeatedly perform the first direction scanning and the second direction scanning to the outside. This scanning operation is repeatedly performed for the entire outer area 40.
  • the detection unit 280 uses the output light from the light source unit 210 as a first electric signal in a first scanning section corresponding to the first area 44 of the external area 40.
  • the second scanning section corresponding to the second area 42 of the external area 40 the received light received from the outside in response to the output light is converted into a second electric signal.
  • the detector 280 may include a photodiode for converting an optical signal into a received signal, that is, an electrical signal.
  • the detector 280 may include an Avalanche Photodiode that converts the weak received light scattered from the external object 240 into an electrical signal as a photodiode having a high photoelectric efficiency.
  • a sampler (not shown) for converting an analog signal into a digital signal may be further provided between the detector 280 and the processor 270.
  • the sampler (not shown) may sample and output the first or second received signal from the detector 280.
  • the processor 270 detects a first distance with respect to the external object 50 using the phase difference between the first transmission signal and the first reception signal having the first frequency. In addition, the processor 270 detects a second distance with respect to the external object 50 using the phase difference between the second transmission signal and the second reception signal having the second frequency. In addition, the processor 270 may finally calculate the final distance using the first distance and the second distance.
  • the processor 270 may control the overall operation of the distance detection device.
  • 5 is a diagram illustrating a distance between a distance detection device and an external object.
  • the distance between the mobile terminal 100 including the distance detecting device 200 and the external object 40 is illustrated as Da.
  • FIG. 6 is an example of an internal block diagram of the distance detecting apparatus of FIG. 1.
  • the distance detecting apparatus 200 of FIG. 6 includes a light source unit 210, a light source driver 260, a 2D scanner 240, a detector 280, and a processor 270.
  • the light source driver 260 outputs a plurality of sinusoidal wave drive signals to the light source unit 210.
  • the sinusoidal drive signal is a transmission signal having different frequencies, and is represented by Tx1 and Tx2 in the drawing.
  • the light source unit 210 outputs output light La having a single wavelength based on a plurality of sinusoidal wave driving signals having different frequencies, that is, a transmission signal.
  • the processor 270 may control the light source driver 260 to output transmission signals having different frequencies.
  • the 2D scanner 240 may output the single-wavelength output light La to the external object 40 while sequentially performing a horizontal scan and a vertical scan.
  • the output light La output to the external object 40 is scattered or reflected by the external object 40. Accordingly, the reception light Lb scattered or reflected by the external object 40 may be received by the distance detection apparatus 200.
  • the detector 280 receives the reception light Lb and converts it into a reception signal that is an electrical signal. On the other hand, since the transmission signals Tx1 and Tx2 having different frequencies are added to the output light La, the detection unit 280 correspondingly receives the reception signals Rx1 and Rx2 having different frequencies from the received light. Can be separated.
  • the separated received signals Rx1 and Rx2 are transmitted to the processor 270, and the processor 270, the processor 270, performs a first transmission signal Tx1 and a first transmission signal Tx1 among a plurality of transmission signals.
  • a first distance with respect to an external object is calculated based on the first received signal Rx1 corresponding to), and the second corresponding to the second transmitted signal Tx2 and the second transmitted signal Tx2 among the plurality of transmitted signals.
  • the second distance with respect to the external object may be calculated based on the second received signal Rx2, and the final distance with respect to the external object may be calculated based on the calculated first and second distances.
  • the distance detection apparatus 200 uses a phase difference method. That is, the distance of the external object is obtained by how much the phase difference is between the transmission signal relating to the output light and the reception signal relating to the reception light.
  • the maximum measurable distance is determined by the frequency of the transmission signal.
  • the frequency of the transmission signal in order to increase the measurable distance, the frequency of the transmission signal must be lowered. In this case, the maximum measurable distance is increased but the resolution is lowered.
  • the distance detecting apparatus 200 adds a plurality of transmission signals when outputting light.
  • each of the plurality of transmission signals may have at least one of a wavelength, a frequency, a radiation timing, and a radiation space.
  • 7A to 7F are graphs illustrating a process of obtaining a final distance using a relationship between two distances after finding distances using two transmission signals.
  • FIG. 7A illustrates distance detection using a first transmission signal and a second transmission signal.
  • the horizontal axis of FIG. 7A represents the actual distance Lr, and the vertical axis represents the calculation distance L'a calculated by the processor 270 based on two transmission signals and a reception signal.
  • Lr the actual distance
  • L'a the calculation distance L'a calculated by the processor 270 based on two transmission signals and a reception signal.
  • the frequency of the first transmission signal is 50MHz
  • the frequency of the second transmission signal is 225MHz.
  • Equation 1 the maximum measurable distance by the first transmission signal can be known.
  • D1 represents the maximum measurable distance of the first transmission signal
  • C represents the speed of light, that is, 3 x 10 8 m / s
  • f1 represents the frequency of the first transmission signal.
  • the maximum measurable distance D1 may be 3 m.
  • Equation 2 the maximum measurable distance measured by the second transmission signal can be known.
  • D2 represents the maximum measurable distance of the second transmission signal
  • C represents the speed of light, that is, 3 x 10 8 m / s
  • f2 represents the frequency of the second transmission signal.
  • the maximum measurable distance D2 may be 0.67 m.
  • the actual distance and the calculation distance coincide with each other up to 3m, but after 3m, the actual distance and the calculation distance are different. Can be.
  • the actual distance and the operation distance are up to 0.67m, but it can be seen that there is a difference thereafter.
  • a distance difference graph as shown in FIG. 7B, may be obtained.
  • the horizontal axis represents the actual distance Lr
  • the vertical axis represents the operation distance difference Ldi according to the two frequencies.
  • FIG. 7C shows the residual of the graph of FIG. 7B divided by [lambda] 2/2 related to the wavelength of the second transmission signal.
  • the result is ⁇ 2/4 for a distance exceeding 3 m, the maximum measurable distance of the first transmission signal.
  • FIG. 7D shows that the distance obtained through the signal of the first transmission signal is corrected based on the result of FIG. 7C.
  • FIG. 7B since the graph pattern after 3m does not coincide with the graph pattern after 0m, since the distance after 3m can be distinguished, the measurable distance can be increased by using the same. Accordingly, a graph as shown in FIG. 7 can be obtained.
  • the horizontal axis of FIG. 7D represents the actual distance Lr, and the vertical axis represents the corrected calculation distance Lc.
  • the frequency ratio between the first and second transmission signals Tx2 is preferably not an integer multiple.
  • the frequency ratio between the first and second transmission signals Tx2 may have a ratio of n + 0.5.
  • the ratio is 4.5.
  • FIG. 7E illustrates a case where an error is included in the calculation distance compared to the actual distance.
  • the graph of FIG. 7E is similar to that of FIG. 7A except that a calculation distance error is included.
  • 8A to 8B illustrate various examples of a scanning method through the distance detection apparatus of FIG. 6.
  • FIG. 8A illustrates that the wavelength of the output light based on the first transmission signal Tx1 and the wavelength of the output light by the second transmission signal Tx2 among the plurality of transmission signals are the same. That is, it illustrates that two transmission signals are added to the output light La of a single wavelength and output.
  • FIG. 8B illustrates that output light La having a single wavelength is output, but different transmission signal frequencies are added for each frame. That is, output light to which the transmission signal of the first frequency f1 is added is output during the first frame Frame 1, and transmission signal of the second frequency f2 is added during the second frame Frame 2. The output light is output, and during the third frame Frame 3, the output light to which the transmission signal of the first frequency f1 is added is output again.
  • a single frequency signal may occupy almost the entire power of the transmission signal, which is advantageous in terms of SNR.
  • harmonic content can be relatively reduced.
  • FIG. 9 is another example of an internal block diagram of the distance detecting apparatus of FIG. 1.
  • the distance detecting apparatus 200 of FIG. 9 includes a light source unit 210, a light source driver 260, a 2D scanner 240, a detector 280, and a processor 270.
  • the light source unit 210 may output a plurality of sine wave driving signals having different frequencies, that is, output light La and Lb corresponding to transmission signals. That is, the output light La1 of the first wavelength corresponding to the first transmission signal Tx1 may be output, and the output light La2 of the second wavelength corresponding to the second transmission signal Tx2 may be output.
  • the detection unit 280 receives the first received light Lb1 and the second received light Lb2, and receives the received signals Rx1 and Rx2 having different frequencies from the received light Lb1 and Lb2. Can be separated.
  • the processor 270 calculates a first distance with respect to the external object based on the first transmission signal Tx1 and the first reception signal Rx1 corresponding to the first transmission signal Tx1 among the plurality of transmission signals. And calculating a second distance with respect to the external object based on the second transmission signal Tx2 and the second reception signal Rx2 corresponding to the second transmission signal Tx2 among the plurality of transmission signals. And a final distance with respect to the external object based on the second distance.
  • 10A to 10B illustrate various examples of a scanning method through the distance detection apparatus of FIG. 9.
  • FIG. 10A illustrates that the wavelength of the first output light La1 based on the first transmission signal Tx1 and the wavelength of the second output light La2 based on the second transmission signal Tx2 among the plurality of transmission signals are different from each other. Illustrate that. That is, it illustrates that two transmission signals are added to the output light La1 and La2 of a different wavelength, respectively, and are output.
  • 10A illustrates the first output light La1 based on the transmission signal of the first frequency f1 and the first signal based on Tx1 on the transmission signal of the second frequency f2 during horizontal and vertical scanning. 2 illustrates that the output light La2 is simultaneously output.
  • FIG. 10B illustrates that output light La having a single wavelength is output, but different transmission signal frequencies are added for each frame. That is, during the first frame (Frame 1), the first output light La1 to which the transmission signal of the first frequency (f1) is added is output, and during the second frame (Frame 2), of the second frequency (f2) The second output light La2 to which the transmission signal is added is output, and the first output light La1 to which the transmission signal of the first frequency f1 is added is output again during the third frame Frame 3. do.
  • 11A to 11F are views for explaining another example of the distance detection method through the distance detection device of FIG. 6 or 9.
  • FIGS. 11A to 11F illustrate the 50 MHz signal and the 225 MHz as the frequencies of two transmission signals, but various modifications are possible as shown in FIGS. 11A to 11F.
  • 11A-11F illustrate 60 MHz, 90 MHz, 120 MHz, 150 MHz, and the like as frequencies of usable transmission signals.
  • the user may vary the set of transmission signals on a frame-by-frame basis or at every distance measurement with respect to an external object.
  • a frequency below 30 MHz is required to measure distances over 5 meters using a single frequency.
  • the maximum measurable distance corresponds to half of the frequency wavelength corresponding to the greatest common divisor of the two frequencies. That is, by using Equation 3 below, the maximum measurable distance may be determined.
  • Dfin represents the maximum measurable distance that can be measured to the maximum using the first transmission signal at the first frequency f1 and the second transmission signal at the second frequency f2, and C is the speed of light, i.e. 3x108 m / s, and fcm represents the greatest common measure frequency of the first frequency f1 and the second frequency f2.
  • the measurable distance D1 by the first frequency f1 is represented by Equation 1 Is 2.5m
  • the measurable distance D2 by the second frequency f2 is 1.67m according to Equation 2
  • the maximum common divisor frequency of the first and second frequencies is 30 MHz, so the final measurable maximum is The distance Dfin increases to 5m in accordance with Equation (3).
  • the greatest common factor of two frequencies is 30 MHz or less.
  • the allowable maximum distance error (Errmax) can be calculated as shown in Equation 4 below.
  • lambda 2 denotes a wavelength of the second frequency f2
  • f1 denotes a first frequency
  • fgcm denotes a maximum common divisor frequency of the first frequency f1 and the second frequency f2.
  • D1 and D2 are 2.5 m and 1.67 m, respectively, and the final measurable maximum distance Dfin is 5 m, and the maximum allowable distance error is. Errmax may be 0.4147 m.
  • the first and second frequencies are 50 MHz and 60 MHz, respectively
  • D1 and D2 are 3 m and 2.5 m, respectively
  • the final measurable maximum distance Dfin is 15 m and the maximum allowable maximum distance error ( Errmax) may be 0.25 m.
  • a difference between D1 and D2 is obtained in FIG. 7A, that is, D1-D2
  • a stepped graph having multiple levels may be illustrated as shown in FIG. 7B.
  • the difference between each level has lambda 2/2. That is, the difference between the first level and the second level is lambda 2/2, and the difference between the second level and the third level has lambda 2/2.
  • Fig. 7C is used, and since this graph is made through the remaining operations described above, it has a value between 0 and lambda 2/2.
  • the maximum distance that can be obtained using the two frequencies f1 and f2 is determined by the greatest common divisor frequency fgcm.
  • the maximum common divisor frequency fgcm is 25 MHz. Accordingly, the maximum measurable distance may be determined as 6m, which is half of the 25MHz wavelength.
  • half of the wavelength will be described in one cycle.
  • the period based on the received signal may be two periods. Whether the measured distance is the first period or the second period can be confirmed through FIG. 7C. However, since FIG. 7C has a value between 0 and ⁇ 2/2, in order to distinguish the two sections as in this case, it can be considered by dividing into two sections of 0 to ⁇ 2/4 and ⁇ 2/4 to ⁇ 2/2. This is related to the maximum distance error. The number of such sections is determined by fgcm / f1. Therefore, the maximum distance error may be calculated as shown in Equation 4.
  • 11A illustrates a distance calculation graph using the first transmission signal and the second transmission signal.
  • the frequency fa of the first transmission signal may be 60 MHz
  • the frequency fb of the second transmission signal may be 90 MHz.
  • the horizontal axis of FIG. 11A represents the actual distance Lr, and the vertical axis represents the calculation distance L'a calculated by the processor 270 based on two transmission signals and a reception signal.
  • a distance difference graph as shown in FIG. 11B, may be obtained.
  • the horizontal axis represents an actual distance Lr
  • the vertical axis represents an operation distance difference Ldi according to two frequencies. Since the levels of the calculation distance differences Ldi according to the two frequencies are different, the distance can be measured up to 5 m. In this case, the allowable maximum distance error may be 0.4147 m.
  • FIG. 11C illustrates a distance calculation graph using the second transmission signal and the third transmission signal.
  • the frequency fb of the second transmission signal may be 90 MHz
  • the frequency fc of the third transmission signal may be 120 MHz.
  • the horizontal axis represents an actual distance Lr
  • the vertical axis represents an operation distance L′ a calculated by the processor 270 based on two transmission signals and a reception signal.
  • a distance difference graph as shown in FIG. 11D, may be obtained.
  • the horizontal axis represents an actual distance Lr
  • the vertical axis represents an operation distance difference Ldi according to two frequencies. Since the levels of the calculation distance differences Ldi according to the two frequencies are different, the distance can be measured up to 5 m. In this case, the allowable maximum distance error may be 0.2083 m.
  • FIG. 11E illustrates a distance calculation graph using the third transmission signal and the fourth transmission signal.
  • the frequency fc of the third transmission signal may be 120 MHz
  • the frequency fd of the fourth transmission signal may be 150 MHz.
  • the horizontal axis of FIG. 11E represents the actual distance Lr, and the vertical axis represents the calculation distance L'a calculated by the processor 270 based on two transmission signals and a reception signal.
  • a distance difference graph as shown in FIG. 11F, may be obtained.
  • the horizontal axis represents an actual distance Lr
  • the vertical axis represents an operation distance difference Ldi according to two frequencies. Since the levels of the calculation distance differences Ldi according to the two frequencies are different, the distance can be measured up to 5 m. In this case, the allowable maximum distance error may be 0.125m.
  • the maximum common divisor of two frequencies is set to less than 30 MHz.
  • the higher the frequency of the two frequencies the smaller the allowable maximum distance error.
  • the distance detecting apparatus 200 of FIG. 6 or 9 may use the method described with reference to FIGS. 11A to 11F.
  • the measurable distance is 5 m. In the case of 50 MHz, the measurable distance is 3 m. In the case of 60 MHz, the measurable distance is 2.5 m. .
  • the maximum common divisor frequency of the two frequencies can be varied.
  • the maximum common divisor frequency it is also possible to vary each frequency as shown in Figs. 11A to 11F.
  • FIG. 12A illustrates output light based on the first and second frequencies ft1 and ft2 at a first time Ta in the mobile terminal 100 including the distance detection device 200.
  • the output to the external object 40a spaced by the distance Dta is illustrated.
  • the first and second frequencies ft1 and ft2 may be 60 MHz and 120 MHz, respectively.
  • the measurable distance can be up to 2.5 m.
  • FIG. 12B shows output light based on the third and fourth frequencies ft3 and ft4 at the second time Tb in the mobile terminal 100 including the distance detection device 200.
  • the third and fourth frequencies ft3 and ft4 may be 50 MHz and 100 MHz, respectively.
  • the measurable distance can be up to 3 m.
  • FIG. 12C shows the output light based on the fifth and sixth frequencies ft5 and ft6 at the third time Tc in the mobile terminal 100 including the distance detecting device 200.
  • the output to the external object 40c spaced by the distance Dtc is illustrated.
  • the fifth and sixth frequencies ft5 and ft6 may be 60 MHz and 90 MHz, respectively.
  • the measurable distance can be up to 5 m.
  • the processor 270 may vary the frequency of the transmission signal. For example, with two frequencies, 60MHz and 90MHz can be selected as the transmission frequencies.
  • the processor 270 of the distance detection apparatus 200 receives a blank area after dividing it into a blank area in which no external object exists and an active area in which the external object exists among the entire scanning intervals.
  • the distance measurement may be performed based on the level of the received signal.
  • it is detected in the blank area on the assumption that the distance detection device value 200 does not output the light, that is, the light source unit 210 does not output the light.
  • the level of the received signal is greater than or equal to a predetermined level, it may be determined that another electronic device uses a frequency similar to the distance detection device, and in order to prevent this, the currently used frequency may be changed. For example, 60 MHz and 90 MHz can be used, and then 120 MHz and 150 MHz can be changed. This makes it possible to stably detect the distance without causing the signal to interfere.
  • the processor 270 of the distance detection apparatus 200 may use 100 MHz and 150 MHz, respectively, for approximately 60 frame periods, and may mix and use 60 MHz and 150 MHz in any one of the frames. In other words, 100MHz and 150MHz with a measurable distance of 3m are used, and preliminarily, 60MHz and 150MHz are mixed, and the two results are compared to determine whether accurate distance measurement is performed within the measurable distance. can do.
  • the processor 270 may change two frequencies being used. For example, you can change to 60 MHz and 150 MHz. As a result, accurate distance detection can be performed.
  • the code signal at the time of output light modulation and the received received light demodulation It is also possible to apply a technique for detecting the distance based on the code signal of. This will be described with reference to FIGS. 13 to 19.
  • the absorbing member absorbs the internal scattered light generated inside the distance detecting apparatus according to another embodiment of the present invention. It is also possible to apply. This will be described with reference to FIGS. 20 to 25.
  • FIG. 13 illustrates projecting light for distance detection in an image processing apparatus including a distance detection device according to another embodiment of the present invention.
  • the image processing apparatus of FIG. 13 illustrates the mobile terminals 100a and 100b.
  • the distance detecting apparatus 200 may be provided in an image processing apparatus such as a mobile terminal, a TV, a set top box, a media player, a game device, a home appliance, a vehicle, and the like. The description centers on.
  • the distance detecting apparatus 200 outputs the output light based on at least one code signal to the external object 40, and receives the light scattered or reflected by the external object 40. Is detected and the distance is detected using the difference between the output light and the received light.
  • the first mobile terminal 100a and the second mobile terminal 100b respectively output the output light to the external object 40.
  • noise by output light from another device may be added to the received light scattered or reflected by the external object 40, or interference between devices may occur.
  • the distance detection apparatus 200 detects the distance based on the code signal at the time of output light modulation and the code signal at the time of demodulating the received light.
  • the code signal is a code signal that is robust to external noise and may be, for example, a pseudo random noise code signal. Accordingly, the distance to the external object can be detected accurately.
  • the distance detecting apparatus 200 when the light source unit uses a plurality of output lights, and accordingly adds a corresponding code signal, output light having a plurality of wavelengths having different absorption rates can be used. As a result, the accuracy of the received light received from the external object can be improved, and the distance to the external object can be accurately detected.
  • the distance detection apparatus 200 when using a plurality of code signals, after detecting the distance information for each code signal, based on the detected distance information, the final distance Information can be calculated. This makes it possible to accurately detect the distance to the external object.
  • the distance detecting apparatus 200 outputs the first output light from the light source unit to the first external region and outputs the second output light to the second external region, thereby detecting the distance detection.
  • the spatial resolution can be improved.
  • the distance detecting apparatus 200 may improve spatial resolution by horizontally scanning the first output light and the second output light from the light source unit with respect to different horizontal lines.
  • the distance detecting apparatus 200 may extend the measurable distance by using a laser diode as a light source and improve the distance resolution.
  • the distance detecting apparatus 200 may use a 2D scanner capable of sequentially performing first direction scanning and second direction scanning when outputting external output light. This eliminates the need for a plurality of scanners, and thus makes it possible to miniaturize the distance detecting device 200. In addition, the manufacturing cost can be reduced. In the meantime, the description of the scanner and the like will be omitted with reference to FIGS. 2A to 2B.
  • the distance detecting apparatus 200 may compare the output light with the received light and detect the distance using the difference.
  • the distance to the external object 40 can be detected based on the code signal at the time of modulation and the code signal at the time of demodulation. The distance detection technique will be described later with reference to FIG. 16A and below.
  • FIG. 14 is an example of an internal block diagram of the distance detection device of FIG. 13.
  • the distance detecting apparatus 200 may include a light source unit 210, a scanner 240, a modulator 266, a processor 270, a memory 272, a demodulator 286, and a receiver 290. It may include.
  • the light source unit 210 may output output light having a predetermined wavelength.
  • the light source unit 210 may output light having an infrared wavelength, but is not limited thereto, and various examples, such as light having a visible wavelength, may be used.
  • the light source unit 210 may output light of at least one wavelength.
  • output light of a single wavelength can be output.
  • a plurality of output lights having different wavelengths may be output.
  • the modulator 266 may drive the light source unit 210 according to a control signal of the processor 270. For example, during operation of the distance detection apparatus 200, the modulator 266 may output at least one modulated code signal to the light source unit 210. That is, the light source unit 210 may be driven so that output light based on the code signal is output.
  • the code signal at this time is a code signal that is robust to external noise and may be, for example, a pseudo random noise code signal.
  • Modulation techniques for the code signal used in the modulator 266 may be various methods. For example, various modulation techniques such as ASK, FSK, PSK, PCM, PWM, PPM, PDM, M-QAM, CDMA, OFDM, etc. may be used based on an input binary-based code signal.
  • modulation techniques such as ASK, FSK, PSK, PCM, PWM, PPM, PDM, M-QAM, CDMA, OFDM, etc. may be used based on an input binary-based code signal.
  • the modulator 266 may output a plurality of modulated code signals so that a plurality of code signals may be added to the output light of a single wavelength. have. At this time, a plurality of code signals may be added to the output light at the same time. Alternatively, a plurality of code signals may be added to the output light at different times.
  • the modulator 266 may output a plurality of modulated code signals when the light source unit 210 outputs output light of a plurality of wavelengths so that each code signal is added to the output light of each wavelength. . That is, the light source unit 210 may be driven to add different code signals to different output light.
  • the output unit 240 can output the output light from the light source unit 210 to the outside.
  • the output unit 240 may receive output light from the light source unit 210, and may sequentially and repeatedly perform first direction scanning (horizontal scanning) and second direction scanning (vertical scanning) to the outside. It can be provided with a scanner.
  • the scanner may be operation controlled based on a feedback signal for horizontal scanning and a feedback signal for vertical scanning.
  • the receiver 290 receives the light received from the external object 40. Meanwhile, the received light from the external object 40 may be received through the output unit 240 without the receiver 290.
  • the receiver 290 may include a detector 280 of FIG. 15 that converts the received light received from the external object 40 into an electrical signal.
  • the detector may include a photodiode for converting an optical signal into an electrical signal.
  • the detector 280 may include an Avalanche photodiode that converts the weak reception light scattered from the external object 40 into a voltage using a photodiode having a high photoelectric efficiency.
  • the demodulator 286 may separate the code signal based on the received light received by the receiver 290. In detail, when the receiver 290 includes the detector 280 of FIG. 15, the demodulator 286 may separate the code signal from the converted electrical signal. The separated code signal is passed to the processor 270.
  • the processor 270 controls operations of the modulator 266 and the like.
  • the processor 270 may generate a code signal using the code signal information stored in the memory 272. The generated code signal may be output to the modulator 266.
  • the processor 270 may receive a code signal separated from the demodulator 286.
  • the processor 270 may detect a distance to the external object 40 based on the code signal from the modulator 266 and the code signal from the demodulator 286.
  • the processor 270 may detect the distance to the external object based on the time difference between the code signal in the modulator 266 and the code signal in the demodulator 286.
  • the processor 270 uses the correlation value of the code signal used in the modulator 266 and the at least one code signal separated from the demodulator 286 to demodulate the processor 286. Selecting a code signal corresponding to the code signal used in the modulator 266 among the at least one code signal separated from, and based on a time difference between the selected code signal and the code signal used in the modulator 266. Thus, the distance to the external object can be detected.
  • the processor 270 uses the plurality of code signals from the modulator 266 and the plurality of code signals from the demodulator 286 to determine a plurality of external objects. Distance information can be detected, and final distance information can be calculated based on the plurality of distance information.
  • the processor 270 may reconstruct the detected distance information into a 2D image by using horizontal and vertical sync signals from the scanner 240, as illustrated in FIG. 2B.
  • the 2D image thus constructed may be updated several times or more and converted into an image.
  • the memory 272 may store data for controlling various operations of the distance detection apparatus 200.
  • the code signal for the output light may be stored, and when the distance is calculated by the processor 270, the stored code signal may be output to the processor 270.
  • the memory 272 may store distance information for each region of the external object 40 when calculating the distance information of the external object 40, and finally, may store distance information of the entire external object 40. Can be stored.
  • FIG. 15 is an example of an internal structure diagram of the distance detection device of FIG. 14.
  • the distance detecting apparatus includes a light source unit 210, a light collecting unit 212, a light reflecting unit 214, a scanner 240, a polarization converting unit 250, a second light reflecting unit 255, and a second light reflecting unit.
  • the light reflection unit 256, the detection unit 280, and the polarization splitter 282 may be included.
  • the light collecting unit 212 collimates the output light output from the light source unit 210.
  • the light collecting unit 212 may include a collimate lens for collimating light having a corresponding wavelength.
  • the output light which has passed through the condenser 212 passes through the polarization separator 282.
  • the polarization separation unit 282 separates the traveling direction according to each polarization direction. For example, the output light is transmitted when the output light is in the P-polarized state, and reflected when the reflected light is the received light in the S-polarized state, and the received light is transmitted to the detector 280.
  • a polarization splitter may be referred to as a polarizer beam splitter.
  • the light reflection unit 214 reflects the output light passing through the polarization splitter 282 toward the scanner 240 and reflects the received light received through the scanner 240 toward the polarization splitter 282. .
  • the light reflection part 214 can reflect light of various wavelengths, not only reflecting the wavelength of output light. Accordingly, the light reflection portion 214 may include a total mirror.
  • the polarization converting unit 250 may convert the polarization direction of the output light and convert the polarization direction of the received light.
  • the polarization converter 250 may control the polarization direction by giving a phase difference, and may convert linearly polarized light into circularly polarized light, or may convert circularly polarized light into linearly polarized light.
  • the polarization converting unit 250 converts output light that is P-polarized light into output light of circular polarization. Accordingly, the scanner 240 can output the output light of the circularly polarized light to the outside, and can receive the received light of the circularly polarized light from the outside. On the other hand, the polarization converting unit 250 may convert the received light of the circularly polarized light received through the scanner 240 into the received light which is S polarized light. Accordingly, the polarization converter 250 may be referred to as a quarter wave length plate (QWP).
  • QWP quarter wave length plate
  • the polarization converting unit 250 may output the output light of the P polarized light as it is without conversion, and may convert the received light of the P polarized light received from the scanner 240 into the received light of S polarized light.
  • the second light reflecting unit 255 reflects the output light passing through the polarization converting unit 250 toward the scanner 240, and reflects the received light received through the scanner 240 toward the polarization converting unit 250. Reflect.
  • the light reflection unit 255 can reflect light of various wavelengths instead of reflecting only the wavelength of the output light. Accordingly, the second light reflection unit 255 may include a total mirror.
  • the third light reflecting unit 256 reflects the output light passing through the second light reflecting unit 255 toward the scanner 240 and reflects the received light received through the scanner 240 to the second light reflecting unit ( 255) direction.
  • the third light reflection unit 256 can reflect light of various wavelengths instead of reflecting only the wavelength of the output light. Accordingly, the third light reflection unit 256 may include a total mirror.
  • the optical path of the output light and the optical path of the received reception light partially overlap.
  • the distance detection device having a structure in which the light output and the optical path of the light reception are partially overlapped may be referred to as a coaxial optical system.
  • the distance detecting device having such a structure can be downsized in size, resistant to external light, and can have a high signal-to-noise ratio.
  • the distance detection apparatus having a structure in which the light output and the light path of the light reception are completely separated from each other may be referred to as a separate optical system.
  • FIG. 16 is a diagram referred to describe a distance detection method of the distance detection apparatus of FIG. 14.
  • the processor 270 of the distance detection device may calculate the distance information by a phase difference, a time difference, pulse counting, or the like of the electrical signal for the output light and the electrical signal for the received light.
  • the distance information level can be calculated according to the time difference ⁇ t between the code signal of the output light and the code signal of the received light.
  • the time difference ⁇ t the time difference between the code signal of the output light and the code signal of the received light.
  • the larger the time difference the farther the external object 40 is, so that the distance information level can be set to be larger, and accordingly, the luminance level can be set to be smaller.
  • the smaller the time difference the closer the external object 40 is, and therefore, the distance information level can be set to be smaller, and accordingly, the luminance level can be set to be larger.
  • 17 to 19 are views referred to for describing the operation of the distance detecting apparatus of FIG. 14.
  • FIG. 17 illustrates one example of a modulation technique in the modulator 266.
  • the figure illustrates BPSK modulation of the generated pseudorandom noise corresponding to the code signal. That is, in order to modulate an analog signal, when the pseudorandom noise values are 1 and -1, the carrier phase is changed to 0 degrees and 180 degrees, respectively.
  • any one of the well known modulation techniques ASK, FSK, PSK, PCM, PWM, PPM, PDM, M-QAM, CDMA, OFDM, etc.
  • 18A and 18B illustrate autocorrelation and cross-correlation characteristics when using a pseudo random noise code signal as a code signal.
  • FIG. 18A illustrates autocorrelation with the same code signal
  • FIG. 18B illustrates cross correlation for different code signals.
  • the processor 270 may perform correlation by using a code signal used in the modulator 266 and a code signal separated from the demodulator 286, and may be used in the modulator 266.
  • the code signal to be coded and the code signal separated by the demodulator 286 are the same code signal, as shown in Fig. 18A, the level is increased in a specific band.
  • the code signal used by the modulator 266 and the code signal separated by the demodulator 286 are different code signals, as shown in FIG. 18B, the level becomes smaller in all bands. That is, it is represented by a noise component.
  • Figure 19 illustrates an example of signal processing for the electrical signal detected by the detector.
  • the demodulator 286 may include the frequency converter 810 of FIG. 19, and the processor 270 may include a despreader 820.
  • the frequency converter 810 converts a carrier-based electrical signal detected by the detector 280 into a baseband-based signal. To this end, a cosine function corresponding to the carrier frequency is used, and a low pass filter may be used.
  • the despreading unit 820 then correlates the baseband-based signal with a pseudo random noise code signal.
  • the spreader code signal may be despread and extract distance information about an external object by using a high correlation level.
  • the processor 270 performs a correlation by using a code signal used by the modulator 266 and a code signal separated by the demodulator 286, while performing a correlation operation, and transmit code signal and receive code.
  • the time delay according to the signal can be identified.
  • the distance information can be calculated in consideration of the identified time delay.
  • the processor 270 when performing a correlation operation, finds a suitable code among the transmission code sets 1, 2, ..., N, ..., K-1, K, and then delays the corresponding code with respect to the transmission signal. By finding the value, the distance to the external object 40 can be calculated. For example, code N does not have a peak value when despreading together with code M ( ⁇ N), so that the code N is searched while changing the code until it has a peak value. If a code having a peak value is found, the delay time can be determined by checking how much the circular value is shifted to the code.
  • the distance detection apparatus 200 may add a plurality of code signals to output the output light of a single wavelength. That is, output light to which the first code signal and the second code signal are added can be output in the same time zone.
  • processor 270 may transmit codes c1, c2,... Which are orthogonal to each other. and cn are all superimposed to produce a C code, and the modulator 266 modulates the code C based on the code C to drive the light source unit 210 to output output light to which a plurality of codes are added.
  • the output unit 240 outputs output light to which a plurality of codes are added.
  • the code signal which is reflected or scattered by the external object 40 and based on the received light, may be a delayed code Cr.
  • Processor 270 includes code c1, c2,... The code of, cn and the received code Cr are correlated. And c1, c2,... the time t1, t2,... which indicates the maximum correlation obtained from the code of, cn Find tn.
  • t1, t2,... A value of, tn is averaged or used as an input value of a specific algorithm to obtain an output value T.
  • the processor 270 calculates the distance to the final external object based on this output value T.
  • the measurement accuracy can be increased by obtaining the effect of measuring n times.
  • the distance detection apparatus 200 may output a single wavelength of output light by adding a plurality of code signals.
  • the output unit 240 outputs the output light to which the first code signal is added among the plurality of code signals during the first period, and outputs the output light to which the second code signal is added among the plurality of code signals during the second period.
  • the processor 270 may perform distance detection by using a transmission code and a reception code.
  • the accuracy of the received light received from the external object can be improved, and the distance to the external object can be accurately detected.
  • the light source unit 210 of the distance detecting device 200 the first light source for outputting the first output light of the first wavelength, and the second output light of the second wavelength.
  • a second light source for outputting, and the modulator 266 adds a first code signal of the plurality of code signals to the first output light, and adds the plurality of code signals to the second output light.
  • the processor 270 may perform distance detection by using a transmission code and a reception code.
  • the light source unit 210 of the distance detecting device 200 the first light source for outputting the first output light of the first wavelength, and the second output light of the second wavelength.
  • a second light source for outputting, and the modulator 266 adds a first code signal of the plurality of code signals to the first output light, and adds the plurality of code signals to the second output light.
  • the output unit 240 may output the first output light for the first period and the second output light for the second period.
  • the processor 270 may perform distance detection by using a transmission code and a reception code.
  • the light source unit 210 of the distance detecting device 200 the first light source for outputting the first output light of the first wavelength, and the second output light of the second wavelength.
  • a second light source to be output, and the output unit 240 may output the first output light to the first external region, and output the second output light to the second external region.
  • the processor 270 may perform distance detection by using a transmission code and a reception code.
  • the light source unit 210 of the distance detecting device 200 includes a scanner which sequentially outputs the light modulated output light to an external region by sequentially performing the first direction scanning and the second direction scanning.
  • the first output light and the second output light may be output to the outside so that the horizontal scanning is performed on the horizontal lines different from the first output light and the second output light.
  • each beam (output If the angular distances between light) are spaced apart by Apixel / N, each k-th beam can converge to the distance value of the passing position when Tpixel / 2 + k / N * Tpixel seconds.
  • Each k-th beam is code c1, c2,... Since it is modulated by the code ck among, cn, the processor 270 can calculate distance information based on the code by each beam. As a result, when using N output lights, the spatial resolution can be increased by N times.
  • the distance detecting apparatus 200 outputs the output light output from the light source unit to the external object 40, and receives the received light scattered or reflected from the external object 40.
  • the distance is detected using the difference between the output light and the received light.
  • an absorbing member that absorbs the internal scattered light generated by the polarized light separating portion (282 of FIG. 20) which transmits a part and reflects the other part is used. Accordingly, the distance to the external object 40 can be easily detected while removing the internal scattered light. Accordingly, the noise due to the internal scattered light is considerably smaller than the received light scattered from the external object 40, so that the measurable distance can be extended and the distance resolution can be improved.
  • an absorbing member for absorbing the internal scattered light generated inside the distance detecting apparatus according to another embodiment of the present invention may be applied. It is possible. This will be described with reference to FIGS. 20 to 25.
  • 20 is an example of an internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • the internal structural diagram of the distance detecting apparatus of FIG. 20 may be the same as the internal structural diagram of the distance detecting apparatus of FIG. 15, and accordingly, description thereof will be omitted with reference to the description of FIG. 15.
  • the processor 270 of the distance detection apparatus may perform distance detection by using a distance calculation method based on a time difference method as shown in FIG. 16 or a phase difference method as shown in FIG. 3. have.
  • 21A to 21C are views referred to for explaining the internal scattered light in the distance detection device.
  • FIG. 21A illustrates the light source unit 210, the light collecting unit 212, the polarization separating unit 282, and the structure 600 in the distance detection apparatus.
  • the light collecting unit 212 collimates the output light output from the light source unit 210.
  • the light collecting unit 212 may include a collimate lens for collimating light having a corresponding wavelength.
  • the polarization separation unit 282 separates the traveling direction according to each polarization direction. For example, the output light is transmitted when the output light is in the P-polarized state, and reflected when the reflected light is the received light in the S-polarized state, and the received light is transmitted to the detector 280.
  • a polarization splitter may be referred to as a polarizer beam splitter.
  • the fixture 600 of another optical component may be disposed around the polarization splitter 282.
  • the fixture 600 is disposed on the right side of the polarization separator 282. That is, the instrument 600 may be disposed in a direction opposite to the direction of the detector 280.
  • FIG. 21B illustrates the polarization splitter 282 transmitting light and reflecting light. That is, the output light L1 output from the light source unit 210 may be transmitted, and the reception light L2 received from the outside may be reflected to transmit the reception light to the detection unit 280.
  • the polarization splitter 282 may transmit a P-polarized beam and reflect the S-polarized beam.
  • FIG. 21C illustrates that the internal scattered light is generated in the polarization splitter 282.
  • the polarization splitter 282 may transmit a beam of P polarization and reflect a beam of S polarization.
  • the light is reflected back from the inner side of the polarization splitter 282 and reflected on the plane of the polarized splitter 282.
  • noise 1 (LN1) noise 3 (LN3), etc., received by being reflected by multiple reflections on the inner surface of the polarization separator 282 may be used. These noises are due to the internal scattered light in the polarization separator 282.
  • the ratio of the weak signal scattered from the external object 40 to the noise due to the internal scattered light becomes the signal-to-noise ratio SNR.
  • the distance at which the SNR is maintained at least 1 may be a measurable distance.
  • noises due to internal scattered light must be reduced.
  • the absorbing member for reducing the noises by the internal scattered light in the distance detecting device will be described.
  • 22A to 22C are various examples of the absorbing member in the distance detecting device according to the embodiment of the present invention.
  • FIG. 22A illustrates black painting 710 attached to polarization splitter 282.
  • FIG. 22B illustrates a polarizing member 720 disposed between the polarization separating unit 282 and the light source unit 210, and specifically, between the polarization separating unit 282 and the light collecting unit 212.
  • the polarizing member 720 may be a polarizer.
  • the polarization contrast is improved by passing the polarizer 720 before passing through the plane of the polarization splitter 282, thereby reducing noises 1 and 2 (LN1, LN2) and the like caused by the reflection of the S-polarized beam. have.
  • FIG. 22C illustrates a photosensitive filter 730 disposed between the polarization separator 282 and the fixture 600.
  • the photosensitive filter 730 may be an absorptive ND filter.
  • the photosensitive filter 730 by using the photosensitive filter 730, the intensity of the beam from the polarization splitter 282 toward the structure 600 can be reduced. As a result, noise can be reduced.
  • FIG. 22D illustrates a black coating 740 formed on the surface of the fixture 600.
  • the black coating 740 may be a black optical coating.
  • the black coating 740 it is possible to reduce the amount of reflected light from the apparatus 600 through absorption, thereby reducing noise.
  • FIG. 22E illustrates multiple reflective path members 750 attached to the fixture 600.
  • the multiple reflection path member 750 is attached to the inclined surface of the fixture 600 to generate multiple reflections. As a result, the amount of reflected light from the fixture 600 can be reduced, thereby reducing noise.
  • noise may be minimized by using at least two of the methods of FIGS. 22A to 22E.
  • FIG. 23 is another example of the internal structural diagram of a distance detecting apparatus according to another embodiment of the present invention.
  • FIG. 23 illustrates a schematic internal structure diagram of the distance detection apparatus, and particularly illustrates a schematic internal structure diagram of the distance detection apparatus employing the method of FIG. 22B among the methods of FIGS. 22A to 22E for reducing the internal scattered light.
  • the light source unit 210, the polarization splitter 282, and the polarization converting unit 250 may be arranged in a line on an optical path.
  • the light source unit 210 may output the output light of the first direction polarization. That is, P-polarized light can output output light.
  • the polarizing member 720 of FIG. 22B is used to increase the polarization contrast. That is, the output light of the LD passes through the polarizerer 720, and P-polarized light is transmitted by the polarization splitter 282. The P-polarized output light is converted into circularly polarized light by the polarization converting unit 250 (QWP), and the scanner 240 scans the external object 40 by this scanning.
  • QWP polarization converting unit 250
  • the received light in the circularly polarized state received by being scattered (backscattered) from the external object 40 becomes the S polarized state after passing through the polarization converter 250 (QWP). Since the polarization splitter 282 reflects the received light in the S polarization state, the detector 280 receives the received light scattered from the external object 40.
  • the detector 280 is reflected by the polarization splitter 282 and converts the received light collected by the light concentrator 213 into an electrical signal.
  • the processor 270 calculates a distance to the external object 40 based on the electrical signal from the detector 280.
  • the polarization contrast may be increased by the polarization member 720 before passing through the polarization splitter 282.
  • the polarization contrast is improved, so that the P polarization component, which is output light, is increased, so that SNR can be improved despite internal noise.
  • the black painting 710 attached to the polarization separation unit 282 of FIG. 22A and the polarization separation unit 282 of FIG. 22C Photosensitive filter 730 disposed between and instrument 600, black coating 740 formed on the surface of instrument 600 of FIG. 22D, multiple reflective path member 750 attached to instrument 600 of FIG. 22E. At least one of the more may be used.
  • the scanner 240 is illustrated as receiving the backscattered received light from the external object 40, but, on the contrary, a separate receiver receives the backscattered received light from the external object 40. It is also possible to receive. In this case, since the output light and the received light are separated, the distance detection device may be referred to as a separate optical system.
  • 24 is another example of an internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • the distance detecting apparatus of FIG. 24 is similar to the distance detecting apparatus of FIG. 23 except that the light source unit is not one but two.
  • the distance detecting apparatus of FIG. 24 includes a first light source unit 210, a first light collecting unit 212, a light reflecting unit 214, a second light source unit 215, a second light collecting unit 217, and an optical wavelength separation unit 219. ),
  • the second detector 285 and the second polarization splitter 287 may be included.
  • the first condenser 212 and the second condenser 217 collimate the output light output from the first light source 210 and the second light source 215, respectively.
  • the first condenser 212 and the second condenser 217 may each include a collimate lens for collimating light having a corresponding wavelength.
  • the first output light passing through the first light collecting part 212 passes through the first polarization separating part 282 through the first polarizing member 720a and passes through the second light collecting part 217.
  • the 2nd output light passes through the 2nd polarization separating part 282 through the 2nd polarizing member 720b.
  • the light reflection unit 214 reflects the first output light passing through the first polarization splitter 282 toward the scanner 240 and separates the first received light received through the scanner 240 from the first polarization splitter. Reflect in the direction of the portion 282.
  • the light reflection part 214 can reflect light of various wavelengths, not only reflecting the wavelength of a 1st output light. Accordingly, the light reflection portion 214 may include a total mirror.
  • the optical wavelength separator 219 may be reflected or transmitted for each wavelength of light, and may be implemented as, for example, a dichroic mirror. In detail, the optical wavelength separator 219 may transmit light having a first wavelength and reflect light having a second wavelength.
  • the optical wavelength separator 219 may transmit the first output light to the scanner 240 and may reflect the second output light to the scanner 240.
  • the optical wavelength separation unit 219 may transmit the first reception light and transmit the light toward the light reflection unit 214, and may reflect the second reception light and transmit the light to the second polarization separation unit 287. have.
  • the polarization converting unit 250 may convert the polarization direction of the output light and convert the polarization direction of the received light.
  • the polarization converter 250 may control the polarization direction by giving a phase difference, and may convert linearly polarized light into circularly polarized light, or may convert circularly polarized light into linearly polarized light.
  • the second light reflecting unit 255 reflects the first and second output light passing through the polarization converting unit 250 toward the scanner 240, and receives the first and second numbers received through the scanner 240.
  • the new light is reflected in the polarization converter 250.
  • the light reflection unit 255 can reflect light of various wavelengths, rather than reflecting only the wavelengths of the first and second output light. Accordingly, the second light reflection unit 255 may include a total mirror.
  • the third light reflecting unit 256 reflects the first and second output light passing through the second light reflecting unit 255 toward the scanner 240 and receives the first and the second light received through the scanner 240. 2 Reflects the received light toward the second light reflection part 255.
  • the third light reflecting unit 256 can reflect light of various wavelengths, instead of reflecting only the wavelengths of the first and second output light. Accordingly, the third light reflection unit 256 may include a total mirror.
  • the first detector 280 converts the first received light reflected by the first polarized light splitter 282 into an electrical signal
  • the second detector 282 is configured by the second polarized light splitter 282. 2 Convert the received light into an electrical signal.
  • the processor 270 calculates a distance to the external object 40 based on the electrical signals from the first detector 280 and the second detector 282.
  • the black painting 710 attached to the polarization separation unit 282 of FIG. 22A and the polarization separation unit of FIG. 22C ( 282 and photosensitive filter 730 disposed between instrument 600, black coating 740 formed on the surface of instrument 600 of FIG. 22D, and multiple reflective path members attached to instrument 600 of FIG. 22E ( At least one of 750 may be further used.
  • 25 is still another example of the internal structure diagram of a distance detection apparatus according to another embodiment of the present invention.
  • the internal structure of the distance detection device of FIG. 25 differs in that the arrangement of the light source 210 and the detector 280 is different.
  • the detection unit 280, the polarization separation unit 282, and the polarization conversion unit 250 are arranged in a line on the optical path.
  • the light source unit 210 outputs the output light of the second direction polarization, that is, the S polarization.
  • the polarization splitting unit 282 reflects the output light of the S polarized light, transmits the light toward the scanner 240, and transmits the received light of the P polarized light. It is delivered to the detector 280.
  • the polarization member 720 of FIG. 22B is used between the light condenser 212 and the polarization splitter 282.
  • the polarization contrast may be increased by the polarization member 720 before passing through the polarization splitter 282.
  • the polarization member 720 cannot be 100% linearly polarized light, but since the polarization contrast is improved, the S polarized light component, which is output light, is increased, so that SNR can be improved despite internal noise.
  • the black painting 710 attached to the polarization separation unit 282 of FIG. 22A and the polarization separation unit 282 of FIG. 22C may be used.
  • the scanner 240 is illustrated as receiving the backscattered received light from the external object 40, but, on the contrary, a separate receiver receives the backscattered received light from the external object 40. It is also possible to receive. In this case, since the output light and the received light are separated, the distance detection device may be referred to as a separate optical system.
  • FIG. 26 is an internal block diagram of the mobile terminal of FIG. 1.
  • the mobile terminal 100 includes a wireless communication unit 110, an A / V input unit 120, a user input unit 130, a sensing unit 140, an output unit 150,
  • the memory 160 may include an interface unit 170, a controller 180, and a power supply 190.
  • the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 113, a wireless internet module 115, an NFC module 117, a GPS module 119, and the like.
  • the broadcast receiving module 111 may receive at least one of a broadcast signal and broadcast related information from an external broadcast management server through a broadcast channel.
  • the broadcast channel may include a satellite channel, a terrestrial channel, and the like.
  • the broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.
  • the mobile communication module 113 transmits and receives a radio signal with at least one of a base station, an external terminal, and a server on a mobile communication network.
  • the wireless signal may include various types of data according to voice call signal, video call signal, or text / multimedia message transmission and reception.
  • the wireless internet module 115 refers to a module for wireless internet access.
  • the wireless internet module 115 may be embedded or external to the mobile terminal 100.
  • the NFC module 117 may perform near field communication.
  • the NFC module 117 may receive predetermined data from the NFC device when approaching the NFC device (not shown) within a predetermined distance, that is, when tagging.
  • the GPS (Global Position System) module 119 may receive location information from a plurality of GPS satellites.
  • the A / V input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121, a distance detector 200, a microphone 123, and the like.
  • the distance detector 200 may be a miniature distance detector.
  • the distance detection unit 200 based on the plurality of transmission signals and the received signal, the final distance calculation for the external object Can be done.
  • the distance detection unit 200 based on the code signal at the time of output light modulation and the received code signal at the time of demodulating received light, as described with reference to FIGS. 13 to 19. Thus, distance detection on the external object can be performed.
  • the distance detector 200 may include an absorbing member that absorbs internal scattered light generated inside the distance detector, as described with reference to FIGS. 20 to 25.
  • the distance detector 200 may be provided in the 3D camera 122 together with the camera 121.
  • the calculated distance information may be transmitted to the controller 180 and used when playing multimedia, in particular, when displaying a 3D image, or transmitted to the outside.
  • the user input unit 130 generates key input data input by the user for controlling the operation of the terminal.
  • the user input unit 130 may include a key pad, a dome switch, a touch pad (constant voltage / capacitance), and the like.
  • the touch pad forms a mutual layer structure with the display unit 151 to be described later, this may be referred to as a touch screen.
  • the sensing unit 140 detects a current state of the mobile terminal 100 such as an open / closed state of the mobile terminal 100, a location of the mobile terminal 100, a presence or absence of user contact, and the like to control the operation of the mobile terminal 100.
  • the sensing signal may be generated.
  • the sensing unit 140 may include a detection sensor 141, a pressure sensor 143, a motion sensor 145, and the like.
  • the motion sensor 145 may detect a movement or position of the mobile terminal 100 using an acceleration sensor, a gyro sensor, a gravity sensor, or the like.
  • the gyro sensor is a sensor for measuring the angular velocity, and may sense a direction (angle) returned with respect to the reference direction.
  • the output unit 150 may include a display unit 151, an audio output module 153, an alarm unit 155, and a haptic module 157.
  • the display unit 151 displays and outputs information processed by the mobile terminal 100.
  • the display unit 151 and the touch pad form a mutual layer structure and constitute a touch screen
  • the display unit 151 is an input device capable of inputting information by a user's touch in addition to the output device. May also be used.
  • the sound output module 153 outputs audio data received from the wireless communication unit 110 or stored in the memory 160.
  • the sound output module 153 may include a speaker, a buzzer, and the like.
  • the alarm unit 155 outputs a signal for notifying occurrence of an event of the mobile terminal 100.
  • the signal may be output in the form of vibration. .
  • the haptic module 157 generates various haptic effects that a user can feel.
  • a representative example of the haptic effect generated by the haptic module 157 is a vibration effect.
  • the memory 160 may store a program for processing and controlling the controller 180 and may provide a function for temporarily storing input or output data (for example, a phone book, a message, a still image, a video, etc.). It can also be done.
  • input or output data for example, a phone book, a message, a still image, a video, etc.
  • the interface unit 170 serves as an interface with all external devices connected to the mobile terminal 100.
  • the interface unit 170 may receive data from such an external device or receive power and transfer the data to each component inside the mobile terminal 100, and allow the data inside the mobile terminal 100 to be transmitted to the external device. .
  • the controller 180 typically controls the operation of each unit to control the overall operation of the mobile terminal 100. For example, related control and processing for voice calls, data communications, video calls, and the like can be performed.
  • the controller 180 may include a multimedia playback module 181 for multimedia playback.
  • the multimedia playback module 181 may be configured in hardware in the controller 180 or may be configured in software separately from the controller 180.
  • the operation of the controller 180 for the multimedia playback, etc. will be described in detail with reference to FIG.
  • the power supply unit 190 receives external power and internal power under the control of the controller 180 to supply power required for the operation of each component.
  • the mobile terminal 100 having such a configuration may be configured to be operable in a communication system capable of transmitting data through a frame or packet, including a wired / wireless communication system and a satellite based communication system. have.
  • a block diagram of the mobile terminal 100 shown in FIG. 26 is a block diagram for one embodiment of the present invention.
  • Each component of the block diagram may be integrated, added, or omitted according to the specifications of the mobile terminal 100 that is actually implemented. That is, two or more components may be combined into one component as needed, or one component may be divided into two or more components.
  • the function performed in each block is for explaining an embodiment of the present invention, the specific operation or device does not limit the scope of the present invention.
  • FIG. 27 is an internal block diagram of the controller of FIG. 26.
  • the controller 180 according to an embodiment of the present invention, the demultiplexer 310, the image processor 320, the processor 330, the OSD generator 340 for multimedia playback , A mixer 345, a frame rate converter 350, and a formatter 360.
  • the audio processing unit (not shown) and the data processing unit (not shown) may be further included.
  • the demultiplexer 310 demultiplexes an input stream. For example, when an MPEG-2 TS is input, it may be demultiplexed and separated into video, audio, and data signals, respectively.
  • the stream signal input to the demultiplexer 310 may be a stream signal output from the broadcast receiving module 111, the wireless internet module 115, or the interface unit 170.
  • the image processor 320 may perform image processing of the demultiplexed image signal. To this end, the image processor 320 may include an image decoder 225 and a scaler 235.
  • the image decoder 225 decodes the demultiplexed image signal, and the scaler 235 may scale the resolution of the decoded image signal in consideration of the output image output from the display unit 151. have.
  • the video decoder 225 may include decoders of various standards.
  • the processor 330 may control overall operations in the mobile terminal 100 or the controller 180.
  • the processor 330 may control the broadcast reception module 111 to control tuning of an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.
  • the processor 330 may control the mobile terminal 100 by a user command or an internal program input through the user input interface unit 150.
  • processor 330 may perform data transmission control with the network interface 135 or the interface 170.
  • processor 330 may control operations of the demultiplexer 310, the image processor 320, and the OSD generator 340 in the controller 180.
  • the OSD generator 340 generates an OSD signal according to a user input or itself. For example, a signal for displaying various types of information in a graphic or text may be generated in an image output to the display unit 151 based on a user input signal.
  • the generated OSD signal may include various data such as a user interface screen, various menu screens, widgets, and icons of the mobile terminal 100.
  • the generated OSD signal may include a 2D object or a 3D object.
  • the mixer 345 may mix the OSD signal generated by the OSD generator 340 and the decoded image signal processed by the image processor 320.
  • the mixed video signal is provided to the frame rate converter 350.
  • the frame rate converter 350 may convert a frame rate of an input video. On the other hand, the frame rate converter 350 can output the data as it is without additional frame rate conversion.
  • the formatter 360 may receive a mixed signal from the mixer 345, that is, an OSD signal and a decoded video signal, and change the format of the signal to be suitable for the display unit 151.
  • the formatter 360 may separate the 2D video signal and the 3D video signal for displaying the 3D video.
  • the format of the 3D video signal may be changed or the 2D video signal may be converted into a 3D video signal.
  • the formatter 360 may use the distance information calculated by the distance detector 200 to display the 3D image.
  • the formatter 360 since the larger the distance information level is, the farther the external object is, the formatter 360 may set the depth information to be smaller. That is, the formatter 360 may set the depth information level in inverse proportion to the distance information level.
  • the 2D image may be converted into a 3D image and output using the depth information.
  • the formatter 360 may set the depth information level to be small and, accordingly, may be depressed and displayed when displaying the 3D image.
  • the formatter 360 may set the depth information level to be large, thereby protruding and displaying the 3D image.
  • the audio processor (not shown) in the controller 180 may perform voice processing of the demultiplexed voice signal.
  • the audio processor (not shown) may include various decoders.
  • the audio processor (not shown) in the controller 180 may process a base, a treble, a volume control, and the like.
  • FIG. 27 illustrates that the signals from the OSD generator 340 and the image processor 320 are mixed in the mixer 345 and then 3D processed in the formatter 360
  • the present invention is not limited thereto. May be located after the formatter. That is, the output of the image processor 320 is 3D processed by the formatter 360, and the OSD generator 340 performs 3D processing together with OSD generation, and then mixes each processed 3D signal by the mixer 345. It is also possible.
  • FIG. 27 a block diagram of the controller 180 shown in FIG. 27 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specification of the controller 180 that is actually implemented.
  • the frame rate converter 350 and the formatter 360 are not provided in the controller 180, but may be provided separately.
  • the image processing apparatus including the distance detecting apparatus according to the embodiment of the present invention is not limited to the configuration and method of the embodiments described above, but the embodiments may be modified in various ways. All or part of the examples may be optionally combined.
  • the present invention is applicable to a distance detecting device capable of detecting a distance to an external object.

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Abstract

L'invention concerne un dispositif de télémétrie, et un appareil de traitement d'images comprenant un tel dispositif. Le dispositif de télémétrie selon un mode de réalisation de l'invention comprend un module source de lumière, un dispositif de balayage, un module de détection, et un processeur. Le module source de lumière sert à produire en sortie une lumière de sortie sur la base d'une pluralité de signaux d'émission de différentes fréquences. Le dispositif de balayage sert à effectuer un balayage dans une première direction puis dans une seconde direction de façon à produire en sortie la lumière de sortie devant arriver dans une zone extérieure. Le module de détection sert à convertir en signaux de réception la lumière reçue qui correspond à la lumière de sortie et qui est reçue de l'extérieur. Le processeur sert à calculer la distance pour atteindre un objet extérieur et à faire varier la fréquence des signaux d'émission, et ce, sur la base de la pluralité des signaux de transmission et de la pluralité de signaux de réception. Le processeur commence par calculer une première distance pour atteindre l'objet extérieur en se basant, d'une part sur un premier signal d'émission de la pluralité de signaux d'émission, et d'autre part sur un premier signal de réception correspondant. Le processeur calcule ensuite une seconde distance pour atteindre l'objet extérieur en se basant, d'une part sur un second signal d'émission de la pluralité de signaux d'émission et d'autre part sur un second signal de réception correspondant au second signal d'émission. Enfin, le processeur calcule une distance finale pour atteindre l'objet extérieur en se basant sur la première et la seconde des distances qui ont été calculées. L'invention permet ainsi de calculer avec précision la distance pour atteindre l'objet extérieur.
PCT/KR2013/012435 2013-01-09 2013-12-31 Dispositif de télémétrie, et appareil de traitement d'images comprenant un tel dispositif WO2014109504A1 (fr)

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US14/759,877 US9869768B2 (en) 2013-01-09 2013-12-31 Device for detecting distance and apparatus for processing images comprising same

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